light bulb

US /ˈlaɪt bʌlb/
UK /ˈlaɪt bʌlb/
"light bulb" picture
1.

an evacuated glass bulb containing a metal filament that glows when incandescent electric current passes through it, used as a source of light.

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The light bulb in the lamp needs to be replaced.
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He screwed the new light bulb into the socket.
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bulblamp
2.

a moment of sudden inspiration or realization.

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Then, a light bulb went off in his head, and he knew how to solve the problem.
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It was a real light bulb moment when I realized my mistake.
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epiphanyrevelationbreakthroughaha moment
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light bulb momentbulblightlightinglightnessin the light oftraffic light